Dams or dams are constructions built to withstand water rates into reservoirs, lakes, or recreation areas. Often dams are also used to drain water into a Hydro Power Plant. Most dams also have sections called water gates to dispose of unwanted water gradually or sustainably. dams as "buildings in the form of soil, stone, concrete, or stone pairs built in addition to holding and storing water, can also be built to accommodate mine or mud waste."
Dams (dam) and weir (weir) are actually different structures. The weir is a low-head dam structure, which serves to raise the water level, usually in the river. The rising river water will melt through the top / overflow. Can be used as a measure of the speed of water flow in the channel / river and can also be a mover of traditional milling in European countries. In countries with large streams and heavy streams, a series of weirs can be operated to form a water transport system. In Indonesia, weirs can be used for irrigation if for example the river water level is lower than the face of the land to be irrigated.
